The company is poised to see volume growth, especially since gas-fired power plants are coming in line in the U.S. over the next decade--and the bulk of them will be using natural gas as their fuel.

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For example, he said, using compressed natural gas as a transportation fuel in a new generation of cars would be a travesty.

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And while there are already prototypes of much more efficient cars on the road -- such as those using natural gas, electricity, hydrogen fuel cells -- they may only be a baby step toward the future.

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Of course, the computer system UPS uses to track this information and other data to optimize driver routes isn't cheap, but the concept is as basic as it gets: Using less fuel saves the company money while reducing greenhouse gas emissions.

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